4.6 cooling mods - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old February 14th, 2015, 06:52 PM
defender1844
Status: Offline
Amit Likhyani
95 D90 Soft Top Estoril Blue 6.2 LS
Member
 
Join Date: Dec 2005
Location: Las Vegas, NV
Posts: 574
4.6 cooling mods

I've got a 4.6 motor and was on the ECR facebook site and noticed that they perform cooling mods to their pursuit motors. Since I already have an upgraded 4.6 I didn't feel it was fair to call them and ask what the mods were but I also thought it would be OK to ask the board. I did notice in August when I got my motor back that when it hit 100 in Austin my temp gauge would creep up but never to a dangerous spot. It cooled off here before I had time to debug. Subsequently I bought a Ron Davis radiator and sent my headers out to be silver ceramic coated. Can anyone speculate on what cooling mods ECR might be referring to for a 4.6? We are hitting 80 now and 100 is right around the corner.
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old February 15th, 2015, 08:22 AM
owen's Avatar
owen
Status: Offline
Owen Jones
Yellow`95 D90 ST #2188
Member
 
Join Date: Mar 2007
Location: Superior, Colorado
Posts: 140
Registry
Great question. When its 100 her in Denver my warmed over 4.6 temp will crreep up. It gets worse at higher altitudes, say 11,000ft. I have done many things, none of which made a big improvement.
Recored radiator with 3 core 'desert cooler' core.
Water wetter additives
Frexalite extream twin puller fans
Experimented with ignition timing.
Experimented with fuel/air mixture
Ceramic coated manifolds

Currently seriously considering larger area radiator with separate oil cooler. Even modifying front crossmember/bodywork to accept. I am pretty sure it needs a 20% oversize area radiator. Extra cores have a minor improvement since the air is already near engine temp by the time it gets to the exta core.

Cooling the 3.9 original motor was an issue in these conditions also - particularly at slow speed and high altitude.

Thats where I am at. I would love to hear any crazy ideas!
__________________
"I think you need a little weatherstripping - right here..."
Reply With Quote
  #3  
Old February 15th, 2015, 10:07 AM
Rufus's Avatar
Rufus
Status: Offline
Rufus
1994 NAS D90 ST #1118
Member
 
Join Date: Apr 2010
Location: South Shore, MASS
Posts: 489
Registry
Quote:
Originally Posted by owen View Post
Great question. When its 100 her in Denver my warmed over 4.6 temp

Cooling the 3.9 original motor was an issue in these conditions also - particularly at slow speed and high altitude.
Thats where I am at. I would love to hear any crazy ideas!
I have been running my 3.9 D90 off road for 14yrs and have certainly experienced this i.e. when the outside temp is 90 (or higher), when the motor is working hard, especially in low range, it will get warm. I have a new OEM radiator and want to get a new water pump, both are important. That said, I want to try installing a different thermostat because there is one that is made for hot conditions. The downside, so I'm told, you get less heater output in the colder weather.
__________________
"Sometimes, there's a man. And I'm talkin' about the Dude here. Sometimes, there's a man, well, he's the man for his time and place"

D90 Yahoo Group member since 2001
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old February 15th, 2015, 10:32 AM
rovertrader's Avatar
rovertrader
Status: Offline
Dale
Tithonus 110, D-90, 109 S/T 5-door
Member
 
Join Date: Jan 2007
Location: Marshville, NC USA
Posts: 4,626
Having similar issues with a new 4.6. We fitted a new 3.5 radiator, and an external oil cooler- waiting to see if this does the trick. Also removed the huge Warn Power Plant winch fitted by PO.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #5  
Old February 15th, 2015, 10:57 AM
owen's Avatar
owen
Status: Offline
Owen Jones
Yellow`95 D90 ST #2188
Member
 
Join Date: Mar 2007
Location: Superior, Colorado
Posts: 140
Registry
Quote:
Originally Posted by Rufus View Post

I have been running my 3.9 D90 off road for 14yrs and have certainly experienced this i.e. when the outside temp is 90 (or higher), when the motor is working hard, especially in low range, it will get warm. I have a new OEM radiator and want to get a new water pump, both are important. That said, I want to try installing a different thermostat because there is one that is made for hot conditions. The downside, so I'm told, you get less heater output in the colder weather.
There is a 'big mouth' thermostat with a colder temp. I have one but before you source it try running without a thermostat in the 100 deg temps. It will still overheat!
__________________
"I think you need a little weatherstripping - right here..."
Reply With Quote
  #6  
Old February 15th, 2015, 04:59 PM
Roverdoc's Avatar
Roverdoc
Status: Offline
Dan Kemper
1997 D90 SW #278
Member
 
Join Date: Dec 2008
Location: Lafayette, CA
Posts: 309
Interesting topic and was always under the assumption factory cooling in good working condition should be a non issue. Getting ready to do a Turner 4.6 top hat block and was planning on just making sure all cooling components were also replaced. If anyone has specific knowledge on how to keep temps low I would also be interested.

Options would be Extra core in the radiator, thermostat as mentioned, good working viscous clutch and fan, ceramic coated headers, some say a mantec snorkel helps to keep temps lower, water wetter, etc and obviously keeping grill free of too many ancillaries.
Reply With Quote
  #7  
Old February 15th, 2015, 05:05 PM
hoxie173's Avatar
hoxie173
Status: Offline
Matt Hawkes
1959 S2
Member
 
Join Date: Mar 2012
Location: Maine United States
Posts: 142
Having the same issue with our 4.6, creeps up to 210 with a 180 stat if your moving slowly especially in low range. Larger capacity radiator makes sense but D2/P38's had the same radiator for 4.0 or 4.6....
Reply With Quote
  #8  
Old February 15th, 2015, 06:12 PM
Rommel's Avatar
Rommel
Status: Online
Rolf
94/95/97 Many
Member
 
Join Date: Jun 2012
Location: Summit NJ USA
Posts: 538
4.6

Subscribed.
__________________
rolfsauto.com
Reply With Quote
  #9  
Old February 15th, 2015, 06:55 PM
rover4x4's Avatar
rover4x4
Status: Offline
Phillip
1995 SW #487/500
Member
 
Join Date: Sep 2003
Location: The Old North State
Posts: 7,522
Registry
RRC fan moves more air than the OE fan on NAS trucks
__________________
Poor gas mileage gets you to the best places on earth
Reply With Quote
  #10  
Old February 15th, 2015, 08:06 PM
Grover's Avatar
Grover
Status: Offline
Mike
Birmabright Bread Box/Swagger Wagon
Member
 
Join Date: Dec 2005
Location: Cincinnati, Ohio
Posts: 1,856
Registry
Question

Is there any reason why a radiator from a 4.6L Range Rover of Disco 2 wouldn't work in a Defender?
__________________
LR3 sidesteps with rocker panels for sale $400


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #11  
Old February 15th, 2015, 08:27 PM
owen's Avatar
owen
Status: Offline
Owen Jones
Yellow`95 D90 ST #2188
Member
 
Join Date: Mar 2007
Location: Superior, Colorado
Posts: 140
Registry
Thats a great bit of info. Moving more air is a big part of the solution and the engine driven fan is very capable. Any improvement on it will have a positive effect on overheating. It just requires high revs to get the most out of it - which a more powerful fan would help.
__________________
"I think you need a little weatherstripping - right here..."
Reply With Quote
  #12  
Old September 4th, 2017, 01:11 AM
lithium1330's Avatar
lithium1330
Status: Offline
Chris
'97 SW NAS 4.6
Member
 
Join Date: Mar 2016
Location: SF Bay Area
Posts: 331
Registry
bumping this old thread if there is any update since 2yrs ago.
The SF area got really hot this wkend, with ambient temp in 104 - 110F range.
During bumper to bumper traffic, without AC, my engine temp (via ODB2) showed 216F - i turned on the heater at full as precaution. Once I got on highway, cruising at 75-80mph, w/o AC, engine temp stayed at 206F.
Earlier in the day, took the truck off-road, <10mph, and temp gauge creeped up to around 225F (before red-zone on the factory temp gauge) and I turned heater on, pulled off, shut down and let it cool off.

So, now I'm thinking... if ambient temp is 104, engine temp reads 206 at 75-80mph, that could be because radiator is unable to keep up (cool). And that at low speed or sit idle, the factory fan isn't able to keep up.

Interestingly, today ambient temp was around a cool 95. I idled the truck at home after some city driving and IR'ed the top rad hose - it showed 190-ish, and lower rad hose was changing between 148 to 180. I could hear the fan get louder and quieter and louder and quiet - fluctuates. After about 15min of idling with hood open, the ODB2 temp reading creeped up to 212F. I'm thinking the fan clutch is going?
__________________
Chris

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
mod

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Latest Mods to the D90 DiscoDino Defender Technical Discussions 10 July 6th, 2005 10:31 AM
01 Disco II 14k miles lots of Mods Disco-HOG For Sale - Vehicles 1 November 27th, 2004 11:29 PM
induction system design and mods jaherring Defender Technical Discussions 3 September 10th, 2004 08:20 PM
drive train custom mods redrover Misc. Chit-Chat 14 June 11th, 2004 09:08 AM
What cooling mods have you done? read Misc. Chit-Chat 6 October 24th, 2003 01:34 PM


All times are GMT -5. The time now is 11:26 AM.


Copyright